Year	mm Hg
1980	124
1981	124.3
1982	124.5
1983	124.8
1984	125
1985	125.3
1986	125.7
1987	126
1988	126.3
1989	126.5
1990	126.8
1991	127
1992	127.2
1993	127.4
1994	127.6
1995	127.8
1996	128
1997	128.2
1998	128.3
1999	128.6
2000	128.8
2001	129
2002	129.2
2003	129.5
2004	129.7
2005	129.9
2006	130.2
2007	130.4
2008	130.7